Simplicity Sewing Pattern S9348 Children’s and Girls’ Costumes. Witchy looks begin with swing dresses in mid-calf and above-knee lengths with round necklines, back zippers and your choice of elbow length sleeves with sheer flounces or long sleeves with puffed details at the upper arms. Add a mock-buckled or waist cincher style belt with grommets, front lacing and flared and zig zag hem skirt options. Tie-on stand collars finish it off. Hats and brooms not included.